Fixed #77 and added systemwide logger

+ Added system wide logger (wip)
+ Fixed issue #77 uptime monitor bug
+ Added backend options for bypass global TLS (or allow per rule TLS settings, wip)
+

src/mod/info/logviewer/logviewer.go

@@ -0,0 +1,122 @@
+package logviewer
+
+import (
+	"encoding/json"
+	"errors"
+	"io/fs"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"imuslab.com/zoraxy/mod/utils"
+)
+
+type ViewerOption struct {
+	RootFolder string //The root folder to scan for log
+	Extension  string //The extension the root files use, include the . in your ext (e.g. .log)
+}
+
+type Viewer struct {
+	option *ViewerOption
+}
+
+type LogFile struct {
+	Title    string
+	Filename string
+	Fullpath string
+	Filesize int64
+}
+
+func NewLogViewer(option *ViewerOption) *Viewer {
+	return &Viewer{option: option}
+}
+
+/*
+	Log Request Handlers
+*/
+//List all the log files in the log folder. Return in map[string]LogFile format
+func (v *Viewer) HandleListLog(w http.ResponseWriter, r *http.Request) {
+	logFiles := v.ListLogFiles(false)
+	js, _ := json.Marshal(logFiles)
+	utils.SendJSONResponse(w, string(js))
+}
+
+// Read log of a given catergory and filename
+// Require GET varaible: file and catergory
+func (v *Viewer) HandleReadLog(w http.ResponseWriter, r *http.Request) {
+	filename, err := utils.GetPara(r, "file")
+	if err != nil {
+		utils.SendErrorResponse(w, "invalid filename given")
+		return
+	}
+
+	catergory, err := utils.GetPara(r, "catergory")
+	if err != nil {
+		utils.SendErrorResponse(w, "invalid catergory given")
+		return
+	}
+
+	content, err := v.LoadLogFile(strings.TrimSpace(filepath.Base(catergory)), strings.TrimSpace(filepath.Base(filename)))
+	if err != nil {
+		utils.SendErrorResponse(w, err.Error())
+		return
+	}
+
+	utils.SendTextResponse(w, content)
+}
+
+/*
+	Log Access Functions
+*/
+
+func (v *Viewer) ListLogFiles(showFullpath bool) map[string][]*LogFile {
+	result := map[string][]*LogFile{}
+	filepath.WalkDir(v.option.RootFolder, func(path string, di fs.DirEntry, err error) error {
+		if filepath.Ext(path) == v.option.Extension {
+			catergory := filepath.Base(filepath.Dir(path))
+			logList, ok := result[catergory]
+			if !ok {
+				//this catergory hasn't been scanned before.
+				logList = []*LogFile{}
+			}
+
+			fullpath := filepath.ToSlash(path)
+			if !showFullpath {
+				fullpath = ""
+			}
+
+			st, err := os.Stat(path)
+			if err != nil {
+				return nil
+			}
+
+			logList = append(logList, &LogFile{
+				Title:    strings.TrimSuffix(filepath.Base(path), filepath.Ext(path)),
+				Filename: filepath.Base(path),
+				Fullpath: fullpath,
+				Filesize: st.Size(),
+			})
+
+			result[catergory] = logList
+		}
+
+		return nil
+	})
+	return result
+}
+
+func (v *Viewer) LoadLogFile(catergory string, filename string) (string, error) {
+	logFilepath := filepath.Join(v.option.RootFolder, catergory, filename)
+	if utils.FileExists(logFilepath) {
+		//Load it
+		content, err := os.ReadFile(logFilepath)
+		if err != nil {
+			return "", err
+		}
+
+		return string(content), nil
+	} else {
+		return "", errors.New("log file not found")
+	}
+}